BS ISO IEC 13962-1997 Information technology - Data interchange on 12 7 mm 112-track magnetic tape cartridges - DLT 2 format《信息技术 12 7mm 112磁道磁带盘上的数据互换 DLT2格式》.pdf

《BS ISO IEC 13962-1997 Information technology - Data interchange on 12 7 mm 112-track magnetic tape cartridges - DLT 2 format《信息技术 12 7mm 112磁道磁带盘上的数据互换 DLT2格式》.pdf》由会员分享，可在线阅读，更多相关《BS ISO IEC 13962-1997 Information technology - Data interchange on 12 7 mm 112-track magnetic tape cartridges - DLT 2 format《信息技术 12 7mm 112磁道磁带盘上的数据互换 DLT2格式》.pdf（70页珍藏版）》请在麦多课文档分享上搜索。

1、BRITISH STANDARD BS ISO/IEC 13962:1995 Information technology Data interchange on12,7 mm, 112-track magnetic tape cartridges DLT 2 format ICS 35.220.20BSISO/IEC13962:1995 This British Standard, having been prepared under the directionof the DISC Board, waspublished under the authorityof the Standard

2、s Boardand comes into effect on 15June1997 BSI 09-1999 ISBN 0 580 27747 X National foreword This British Standard reproduces verbatim ISO/IEC13962:1995 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee IST/4, Magnetic and opti

3、cal media for digital data, which has the responsibility to: aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European

4、developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards

5、Catalogue under the section entitled “International Standards Correspondence Index”, or using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their

6、 correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the ISO/IEC title page, pages ii to viii, pages1 to56 and a back cover. This standard has

7、 been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Amendments issued since publication Amd. No. Date CommentsBSISO/IEC13962:1995 BSI 09-1999 i Contents Page National foreword Inside front cover Forewor

8、d vii Text of ISO/IEC 13962 1ii blankBSISO/IEC13962:1995 ii BSI 09-1999 Contents Page Foreword vii Introduction 1 Section 1. General 1 Scope 1 2 Conformance 1 2.1 Magnetic tape cartridges 1 2.2 Generating systems 1 2.3 Receiving systems 1 3 Normative references 1 4 Definitions 1 4.1 Average Signal A

9、mplitude 1 4.2 azimuth 2 4.3 back surface 2 4.4 Beginning-Of-Tape marker (BOT) 2 4.5 byte 2 4.6 cartridge 2 4.7 Cyclic Redundancy Check (CRC) character 2 4.8 Early Warning (EW) 2 4.9 Error-Detecting Code (EDC) 2 4.10 End-Of-Tape marker (EOT) 2 4.11 Entity 2 4.12 Error-Correcting Code (ECC) 2 4.13 fl

10、ux transition position 2 4.14 flux transition spacing 2 4.15 Logical Block 2 4.16 logical track 3 4.17 magnetic tape 3 4.18 Master Standard Reference Tape 3 4.19 object 3 4.20 physical block 3 4.21 physical recording density 3 4.22 physical track 3 4.23 Record 3 4.24 Reference Edge 3 4.25 Reference

11、Field 3 4.26 Secondary Standard Reference Tape 3 4.27 Standard Reference Amplitude (SRA) 3 4.28 Standard Reference Current 3 4.29 Test Recording Current 4 4.30 Typical Field 4 5 Conventions and notations 4 5.1 Representation of numbers 4 5.2 Names 4 5.3 Acronyms 4 6 Environment and safety 4 6.1 Cart

12、ridge and tape testing environment 5 6.2 Cartridge operating environment 5 6.3 Cartridge storage environment 5 6.4 Safety 5 6.4.1 Safeness 5BSISO/IEC13962:1995 BSI 09-1999 iii Page 6.4.2 Flammability 5 6.5 Transportation 5 Section 2. Requirements for the unrecorded tape 7 Mechanical and electrical r

13、equirements 6 7.1 Material 6 7.2 Tape length 6 7.3 Width 6 7.4 Total thickness 6 7.5 Thickness of the base material 6 7.6 Thickness of the magnetic coating 6 7.7 Thickness of the back coating 6 7.8 Discontinuity 6 7.9 Longitudinal curvature 6 7.9.1 Requirement 6 7.9.2 Procedure 6 7.10 Out-of-Plane d

14、istortions 6 7.11 Cupping 6 7.12 Roughness of the coating surfaces 7 7.12.1 Roughness of the back coating surface 7 7.12.2 Roughness of the magnetic coating surface 7 7.13 Coating adhesion 7 7.14 Layer-to-layer adhesion 7 7.14.1 Requirements 7 7.14.2 Procedure 8 7.15 Modulus of elasticity 9 7.15.1 R

15、equirement 9 7.15.2 Procedure 9 7.16 Flexural rigidity 9 7.16.1 Requirement 9 7.16.2 Procedure 9 7.17 Tensile yield force 9 7.17.1 Procedure 9 7.18 Electrical resistance 9 7.18.1 Requirement 9 7.18.2 Procedure 9 7.19 Inhibitor tape 10 7.20 Abrasivity 10 7.20.1 Requirement 10 7.20.2 Procedure 10 7.21

16、 Light transmittance of the tape and the leader 11 7.22 Coefficient of dynamic friction 11 7.22.1 Requirements 11 7.22.2 Procedure for the measurement of the friction between the magnetic surface and the back surface 11 7.22.3 Procedure for the measurement of the friction between the magnetic surfac

17、e or the back surface and calcium titanate ceramic 12 8 Magnetic recording characteristics 12BSISO/IEC13962:1995 iv BSI 09-1999 Page 8.1 Typical Field 12 8.2 Signal amplitude 12 8.3 Resolution 12 8.4 Overwrite 13 8.4.1 Requirement 13 8.5 Peak shift 13 8.5.1 Requirement 13 8.5.2 Procedure 13 9 Tape q

18、uality 14 9.1 Missing pulses 14 9.1.1 Requirement 14 9.2 Missing pulse zone 14 9.2.1 Requirement 14 9.3 Tape durability 14 Section 3. Mechanical specifications of the tape cartridge 10 General 15 10.1 Bottom side and right side 15 10.2 Back side and left side 16 10.3 Tape reel 17 10.4 Tape leader 17

19、 10.5 Front side 19 10.6 Operation of the cartridge 19 10.7 Tape winding 20 10.8 Moment of inertia 20 10.9 Material 20 Section 4. Requirements for an interchanged tape 11 Method of recording 32 11.1 Physical recording density 32 11.2 Bit cell length 32 11.2.1 Average bit cell length 32 11.2.2 Long-t

20、erm average bit cell length 32 11.2.3 Short-term average bit cell length 32 11.3 Flux transition spacing 32 11.4 Read signal amplitude 32 11.5 Azimuth 32 11.6 Channel skew 32 12 Tape format 32 12.1 Reference Edge 32 12.2 Direction of recording 32 12.3 Tape layout 33 12.4 Calibration and Directory Ar

21、ea 33 12.4.1 Scratch Area 34 12.4.2 Guard Area G1 34 12.4.3 Calibration Tracks Area 34 12.4.4 Guard Area G2 35 12.4.5 Directory Area 35 12.4.6 Guard Area G3 35 12.5 Data Area 36BSISO/IEC13962:1995 BSI 09-1999 v Page 12.5.1 Physical tracks 36 12.5.2 Width of the physical tracks 36 12.5.3 Logical trac

22、ks 36 12.5.4 Locations of the physical tracks 36 12.5.5 Layout of tracks in the Data Area 39 13 Data format 40 13.1 Data Bytes 40 13.2 Logical Blocks 40 13.3 Data Blocks 40 13.4 Types of Logical Blocks 40 13.5 Entities 41 13.6 Logical Block format 41 13.6.1 Preamble 41 13.6.2 Sync 41 13.6.3 Data Fie

23、ld 41 13.6.4 Control Field 1 (CF1) 42 13.6.5 Control Field 2 (CF2) 43 13.6.6 CRC 45 13.6.7 Postamble 45 14 Use of Logical Blocks 45 14.1 Data Blocks 45 14.2 Tape Mark Blocks 45 14.3 Filler Blocks 45 14.4 End of Track Blocks (EOTR) 45 14.5 End of Data Blocks (EOD) 45 14.6 ECC Blocks 45 15 Format of E

24、ntities 45 16 Error handling 46 Annex A (normative) Measurement of light transmittance 47 Annex B (normative) CRC generation 50 Annex C (normative) ECC generation 50 Annex D (normative) Format of Control Field 1 53 Annex E (normative) Format of Control Field 2 54 Annex F (informative) Recommendation

25、s for transportation 54 Annex G (informative) Inhibitor tape 55 Annex H (informative) Recommendations on tape durability 55 Annex J (informative) Handling guidelines 56 Figure 1 Measurement of the coating adhesion 7 Figure 2 Measurement of layer-to-layer adhesion 8 Figure 3 Measurement of electrical

26、 resistance 10 Figure 4 Measurement of abrasivity (not to scale) 11 Figure 5 Measurement of peak shift 13 Figure 6 General view 21 Figure 7 Reference planes 22 Figure 8 Bottom side 23 Figure 9 Right side 24 Figure 10 Back side 24 Figure 11 Left side 25BSISO/IEC13962:1995 vi BSI 09-1999 Page Figure 1

27、2 Cross section, non-operating position 26 Figure 13 Cross section, operating position 27 Figure 14 Leader/tape connection 27 Figure 15 Position of the splice tape 28 Figure 16 Tape leader 29 Figure 17 Front side 30 Figure 18 Back side, position of the door lock 31 Figure 19 Position of the leader t

28、ip 31 Figure 20 Tape layout 33 Figure 21 Calibration and Directory Area 33 Figure 22 Calibration Tracks Area 35 Figure 23 Layout of the tracks of the Data Area 39 Figure 24 Block format 41 Figure 25 Content of Control Field 1 42 Figure 26 Content of Control Field 2 44 Figure A.1 Optical arrangement

29、49 Figure A.2 Measuring circuitry 49 Figure C.1 ECC Blocks 51 Figure D.1 Format of CF1 53 Figure E.1 Format of CF2 54 Table 1 Physical Track Locations 37 Descriptors: Data processing, information interchange, data recording devices, magnetic recording, magnetic tapes, half-inch magnetic tapes, magne

30、tic tape cartridges, specifications, dimensions, mechanical properties, electrical properties, magnetic properties, formats, track formats, interchangeability.BSISO/IEC13962:1995 BSI 09-1999 vii Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechn

31、ical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical act

32、ivity. ISO and IEC technical committees collaborate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical comm

33、ittee, ISO/IEC JTC 1. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an International Standard requires approval by at least75% of the national bodies casting a vote. International Standard ISO/IEC13962 was prepared

34、 by ECMA (as Standard ECMA-197) and was adopted, under a special “fast-track procedure”, by Joint Technical Committee ISO/IEC JTC 1, Information technology. Annex A toAnnex E form an integral part of this International Standard. Annex F to Annex J are for information only.viii blankBSISO/IEC13962:19

35、95 BSI 09-1999 1 Section 1. General Introduction ISO/IEC 13421 1)specifies a magnetic tape cartridge in which the 12,7mm wide magnetic tape is recorded on48 parallel physical tracks, recorded and read in pairs, which constitute two groups, the first recorded and read in forward direction, the second

36、 in reverse direction. This International Standard constitutes a further development of the cartridge specified in ISO/IEC13421 in that the number of tracks has been raised from48 to112, thus raising the total capacity of the cartridge accordingly. Drives for cartridges according to this Internation

37、al Standard may be able to read from, and write onto, cartridges according to ISO/IEC13421. 1 Scope This International Standard specifies the physical and magnetic characteristics of a12,7mm wide, 112-track magnetic tape cartridge, to enable interchangeability of such cartridges. It also specifies t

38、he quality of the recorded signals, a format called Digital Linear Tape2 (DLT 2) and a recording method. Together with a labelling standard, e.g. ISO1001, it allows full data interchange by means of such magnetic tape cartridges. 2 Conformance 2.1 Magnetic tape cartridges A magnetic tape cartridge s

39、hall be in conformance with this International Standard if it satisfies all mandatory requirements of this International Standard. The tape requirements shall be satisfied throughout the extent of the tape. 2.2 Generating systems A system generating a magnetic tape cartridge for interchange shall be

40、 entitled to claim conformance with this International Standard if all the recordings that it makes on a tape according to2.1 meet the mandatory requirements of this International Standard. 2.3 Receiving systems A system receiving a magnetic tape cartridge for interchange shall be entitled to claim

41、conformance with this International Standard if it is able to handle any recording made on a tape according to2.1. 3 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard. At the time of publication

42、, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards listed below. Members of IEC and ISO maintain registers of cu

43、rrently valid International Standards. ISO 1001:1986, Information processing File structure and labelling of magnetic tapes for information interchange. ISO 1302:1992, Technical drawings Method of indicating surface texture. 4 Definitions For the purpose of this International Standard, the following

44、 definitions apply. 4.1 average signal amplitude the average peak-to-peak value of the output signal from the read head at the physical recording density of1674ftpmm measured over a minimum length of track of25,4mm, exclusive of missing pulses 1) ISO/IEC 13421:1993, Information technology Data inter

45、change on12,7mm, 48-track magnetic tape cartridges DLT1 format.BSISO/IEC13962:1995 2 BSI 09-1999 4.2 azimuth the angular deviation, in minutes of arc, of the mean flux transition line of the recording made on a track from the line normal to the Reference Edge 4.3 back surface the surface of the tape

46、 opposite the magnetic coating which is used to record data 4.4 beginning-of-tape marker (BOT) a hole punched on the centreline of the tape towards the end nearest to the leader 4.5 byte an ordered set of bits acted upon as a unit NOTE 1In this International Standard, all bytes are8-bit bytes. 4.6 c

47、artridge a case containing a single supply reel of12,7mm wide magnetic tape with a leader attached at the outer end 4.7 cyclic redundancy check (CRC) character a 64-bit character, generated by a mathematical computation, used for error detection 4.8 early warning (EW) a signal generated by the drive

48、 indicating the approaching end of the recording area 4.9 error-detecting code (EDC) a mathematical computation yielding check bytes used for error detection 4.10 end-of-tape marker (EOT) a hole punched on the centreline of the tape towards the end farthest from the leader 4.11 entity a group of ten

49、 Logical Blocks treated as a logical unit and recorded on a logical track 4.12 error-correcting code (ECC) a mathematical computation yielding check bytes used for the correction of errors detected by the CRC and the EDC 4.13 flux transition position the point which exhibits the maximum free-space flux density normal to the tape surface 4.14 flux transition spacing the distance on the magnetic tape between successive flux transitions 4.15 logical block the two physical blocks simultaneously